check engine light

[kondo]

I have had some issues with my check engine light since I put on my SC. The first day that I had it installed by a toyota dealership the check engine went off after I drove it around for a few hours. I took it back and they told me that a vacume hose came off they fixed it and I never had any issues until I put on a 2.75 pulley. The first time that I hit the top of my rpm's the check engine light started flashing, then it turned off. The next day the check engine light came on again when I put the pedal to the floor. I got pissed and took the 2.75 pulley off and put the stock one back on. Then I disconnected the negative on my battery and pushed on the brake to reset the ecu. I tried driving my car hard with the stock pulley on and the check engine light never went off. I recently got a 2.9 pulley. At first I drove it around for a few days and the check engine light never went off. Then one rainy day I decided to do a burn out and it instanly set off the check engine light and it stuck on, so I reset the ECU again and have been driving easy. A few days ago I nailed it and the check engine light flashed on for a second and then went off. I can't figure it out. Could it be the air to fuel ratio sucks and is running too lean? I am getting SAFC installed on the 24th but I am wondering if any one else has had simmilar issues with their SC. I am also running a greddy evo and a injen intake.

Nick

[NASTY]

my guess is the S-AFC will help that problem
(upgrading the pulley without it isnt reccomended)

[Yanks0114]

It definately sounds like you are running lean. I wouldnt push the car much until the Safc got installed.

[Flipside909]

You're probably running dangerously lean or you have an O2 or EGR sensor going out. It's best to go back and get the code read.